Wadge hierarchy and veblen hierarchy part I: Borel sets of finite rank

Journal of Symbolic Logic 66 (1):56-86 (2001)
Abstract
We consider Borel sets of finite rank $A \subseteq\Lambda^\omega$ where cardinality of Λ is less than some uncountable regular cardinal K. We obtain a "normal form" of A, by finding a Borel set Ω, such that A and Ω continuously reduce to each other. In more technical terms: we define simple Borel operations which are homomorphic to ordinal sum, to multiplication by a countable ordinal, and to ordinal exponentiation of base K, under the map which sends every Borel set A of finite rank to its Wadge degree
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Raphaël Carroy (2013). Playing in the First Baire Class. Mathematical Logic Quarterly 30 (1-2):10.
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